Diesel power ram



met., 22, H942., K HAAGE 2,35f772 DIESEL POWER RAM Filed Sept. 19, 1940f i f /7 fvf f 45 l Uff f f/f 9&4 /c

Patented Dec. 22, 1942 NITED STATES DIESEL POWER RAM Konrad Haage,Esslingen n the Neckar, Germany; vested in the Alien Property CustodianApplication September 19, 1940, Serial No. 357,483 In Germany August 9,1939 2 Claims.

My invention relates to power rams and the like of the Diesel enginetype and more particularly to apparatus of this kind in which the ramproper constitutes the piston or cylinder of a Diesel engine and islifted by each explosion dropping freely thereafter.

In my copending application Serial No. 332,807- filed May 1, 1940, forDiesel power ram I have disclosed a power ram of this type in which theimpact of the ramk proper is utilized for the atomizing of the fuel, sothat the high pressure pump and spray nozzle hitherto used for thepurpose which are unfavorably influenced by the ramrning operation canbe dispensed with. According to this invention the impact or blow of theram upon a pan-like cavity arranged in the combustion chamber of theengine is utilized for atomizing the fuel deposited into this cavity.

The simplest way of operating such an engine seemed to introduce thefuel into the pan-like cavity during the upward movement of the ramproper. It has now been found that this mode of operation is unsuitablesince the upward stroke of the piston and the current of fresh airsucked into the cylinder generate strong whirls which scatter unatomizedfuel which is thus partly lost by escaping through the exhaust slits.Moreover atomization of the fuel then becomes very irregular, wherebythe working strokes of the ram become unequal and its eiciency isconsiderably diminished.

These drawbacks are overcome according to the present invention byinjecting the fuel into the cavity in the cylinder bottom only duringthe downward or compression stroke of the piston shortly before thepiston reaches and covers the exhaust slits of the cylinder. Byproceeding in this manner I avoid the necessity of injecting the fuelunder high pressure and am enabled to correctly deposit it in thecavity, in which it is then uniformly scattered and atomized by theimpact of the piston.

In the drawing affixed to this specification and forming part thereof,an embodiment of my invention is illustrated diagrammatically by way ofexample in longitudinal section.

Referring to the drawing, piston I which forms the ram proper,reciprocates in the cylinder 2 and, when dropping, strikes the cylinderbottom or anvil 3 which rests on the pile to be rammed. This anvil 3 isformed with a pan-like cavity 9 and the striking face I0 of the piston Iis formed to t in this cavity 9. Liquid fuel deposited in the cavity 9is scattered and atomized by the impact of the piston I so as to beimmediateli7 burnt in the compressor space of the cylinder, due to thehigh temperature prevailing therein, and by its combustion pressurelifts the piston I. The gases of explosion are exhausted through theslits 5, whereupon fresh air is sucked in for the next combustionstroke. The exhaust ports or slits 5 are arranged at a point in thecylinder wall which is spaced from the fuel pump presently to bedescribed by a distance greater than the axial length of the cylindricalpiston walls.

The piston controls a metering pump -6 for the fuel, the fiaring toppart I8 of the piston I acting on the rod I2, which projects into thecylinder 2, of the pump piston I3 which is acted upon by the spring I9.The fuel supply pipe 20 discharges from the fuel container l, providedwith a check valve I5, into the space in front of the piston I3, fromwhich a pipe 4 leads to the lower end of the cylinder. I prefer toinsert another valve 2| between the pipe 4 and the metering pump 6.

In the operation of the ram fuel is allowed to flow from the container 1into the pump cylinder whenever the pump piston I3 is forced back by theram piston I. When this latter piston approaches the slits 5, itsflaring end I8 allows the pump piston to move to the left whereby thefuel in the pump is forced through the check valve 2| into the bottompart of the cylinder 2, being deposited in the cavity 9. At the sametime the air trapped below the piston I is forced out through the slits5 until these slits are covered by the piston, but no disturbingmovement of air occurs below the slits, where the fuel is discharged andcollected.

In this manner the fuel is atomized in a particularly perfect anduniform manner.

I wish it to be understood that I do not desire to be limited to theexact details of construction shown and described for obviousmodifications will occur to a person skilled in the art.

I claim:

l. A power ram comprising in combination, a substantially verticallyarranged cylinder of a Diesel engine. a piston in said cylinder, one ofsaid parts being stationary, the other freely reciprocable relative tothe stationary part, means for depositing the quantity of fuel requiredfor a ram stroke on the surface of the stationary part within saidcylinder, which lies in the path of and is hit by said reciprocablepart, when it drops, a gas exhaust port in one of said parts and means,arranged to be controlled by the other part during its downward orcompression stroke, for actuating said fuel depositing means for fueldelivery onto said surface, whenever said other part approaches, butbefore it covers. said exhaust port.

2. The ram of claim 1, in which the cylinder is stationary, the pistonreciprocable, while a mem ber operatively connected with the fueldepositing means projects into the path of the piston, a flaring portionof the piston forming the actuating means, the surface being thecylinder bottom surface and the exhaust port being spaced from saidactuating means a distance greater than the length of the piston surfaceparallel to the inner cylinder surface.

KONRAD HAAGE.

